Fasteners required to be tightened ( as per manufacturer's torque value) in a Mill.
| -Sole
plate to foundation anchor bolt |
| -Side assembly to mounting
plate foundation anchor bolt |
| -Gear box base to sole plate |
| -Bowl hub to gear box super
bolt |
| -Side assembly to separator
body |
| -Separator body to separator
top |
| -Bowl extension ring |
| -Bowl clamping ring |
| -Vane wheel assembly |
| -Separator top to valve out let |
| -Valve out let to Mill Discharge Valve |
| -Mill Discharge Valve to valve adaptor |
| -Journal head to trunnion shaft |
| -Journal shaft to journal head |
| -Keeper plate to journal shaft |
| -Journal liner to journal shaft |
| -Journal opening cover to
separator body |
| -Journal spring to JOC As these bolts or nuts are to be torqued tightened it is necessary to |
about the torque wrench available in the Market. There are three types of torque wrenches
available in the market e.g pneumatic( driven by compressed air),electric ( driven by electric
power) and manual. For Mill we prefer manual wrenches as variance are more.
Standard Tolerances for Mill erection job
Foundation: ( Mill , motor , gear box , Lubrication unit )
- Disposition with respect to Boiler axis ( Tolerances +/- 5 mm )
- Elevation of Top of foundation after chipping of loose concrete ( Tolerances +/- 10 mm)
- Center line of foundation bolt hole with respect to foundation center line ( Tolerances +/- 2 mm)
- Diagonals of bolt hole center ( Tolerance +/- 5 mm)
- Depth of foundation hole ( Tolerance +/- 10 mm )
- Spacing between the pockets ( Tolerance +/- 2 mm)
It is to be noted before casting of Mill foundation and other important rotating machine foundations
like ID ,FD ,PA etc . A cross check should be done with civil drawing and equipment supplier
drawing . There is chance of mistake due to various reasons and once casting is over it may take
lot of time to rectify.
BASE / SOLE PLATES
-Leveling of Base Plates for Gear Box ( Tolerance 0.1 mm/M)
-Leveling of mill air side housing sole plates ( Tolerance 0.2 mm/M)
- Grouting Gap between base plates and foundation ( Tolerance 40 +/- 10 mm)
- Leveling of Motor Base within +/_ 0.05 mm/M
-
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LINK 2 - PLEASE CLICK HERE
BASE / SOLE PLATES
-Leveling of Base Plates for Gear Box ( Tolerance 0.1 mm/M)
-Leveling of mill air side housing sole plates ( Tolerance 0.2 mm/M)
- Grouting Gap between base plates and foundation ( Tolerance 40 +/- 10 mm)
- Leveling of Motor Base within +/_ 0.05 mm/M
-
P.S If you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below
LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
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